CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Net sales and operating revenues	$ 15,379	$ 17,450	$ 11,763
Costs and expenses
Cost of sales (exclusive of depreciation and amortization)	13,402	14,912	10,002
Selling, general, and administrative	889	1,138	752
Depreciation and amortization	639	673	345
Engineering, research, and development	273	324	200
Restructuring charges, net and asset impairments	622	126	117
Goodwill and intangible impairment charges	383	241	3
Costs and expenses	16,208	17,414	11,419
Other income (expense)
Non-service pension and postretirement benefit (costs) credits	18	(11)	(20)
Equity in earnings (losses) of nonconsolidated affiliates, net of tax	47	43	18
Gain (loss) on extinguishment of debt	2	0	(10)
Other income (expense), net	38	53	(10)
Total other expense (income)	105	85	(22)
Earnings (loss) before interest expense, income taxes, and noncontrolling interests	(724)	121	322
Interest expense	(277)	(322)	(148)
Earnings (loss) before income taxes and noncontrolling interests	(1,001)	(201)	174
Income tax (expense) benefit	(459)	(19)	(63)
Net income (loss)	(1,460)	(220)	111
Less: Net income (loss) attributable to noncontrolling interests	61	114	56
Net income (loss) attributable to Tenneco Inc.	$ (1,521)	$ (334)	$ 55
Basic earnings (loss) per share:
Basic earnings (loss) per share of common stock (in dollars per share)	$ (18.69)	$ (4.12)	$ 0.93
Weighted average shares outstanding (in shares)	81,378,474	80,904,060	58,625,087
Diluted earnings (loss) per share:
Diluted earnings (loss) per share of common stock (in dollars per share)	$ (18.69)	$ (4.12)	$ 0.93
Weighted average shares outstanding (in shares)	81,378,474	80,904,060	58,758,732